Dolly-hammer cylinder front head



Oct. 27, 1925. 1,559,338

M. MCHALE DOLLY HAMMER CYLINDER FRONT HEAD Filed Sept. 18, 1923 2 Sheets-Sheet 1 WITNESSES IN VEN TOR zm zerav Mc [MLB A TTORNE YS Oct. 27, 1925.

M. M HALE DOLLY HAMMER CYLINDER FRONT HEAD Filed Sept. 18, 1923 WITNESSES 2 Sheets-Shut 2 gmmmu INVENTOR IVIHKTIN McHqLE ATTORNEYS Patented Oct. 27, 1925.

MARTIN MQHALE, OF ANYO'X, BRITISH COLUMBIA, CANADA.

penny-HAMMER CYLINDER om HEAD.

v Application filed September 18, 1923. Serial in). 663,438.

T 0 all whom it mag 0031067 41,:

'Be it known that I, MARTIN a' citizen of Canada, and a resident of- Anyox,

in the Province of British Columbia and Dominion of Canada, have invented a new and Improved Dolly-Hammer Cylinder Front Head, of which'the following is a full, clear, and exact description.

This invention has relation. toldrill sharpl eners and has particular reference to an improvement in a dolly hammer cylinder front head which is particularly designed for use in connection with a Model 8 Waughv drill sharpener although thesame is not necessarily restrictedto use in connection with this machine.

At the present time -the cylinder front head in which the dollies are mountedfor rapid reciprocation are provided with'no means for compensating for the we ar on the shanks of the dollies or on the bearing surfaces with which they contact and it thus follows that after a limited time the dolly.

boxes: or retainers become so badly wornl that they must be' replaced at a greater expense.

Itis, therefore, the principal object of the present invention to provide a front head which includes means for compensating for the wear on thedolly shank and its bearing of the dollies and the bearings. I

As a furtherobject the invention contemplates more specifically a dolly hammer cylinder front headlwhichis provided with a separate shoe or bearingblock.nponwhich the shank of the dollyrests and moves in order to prevent wear on the mainybodyiofj the front head whereby thegshoe or bearing; block when wornmay be replaced 'at'a very;

small expense. Y p As a still further object the invention contemplates a dolly hammer" cylinder' fronti head 'which'is provided with a cover and means for retaining the samein covering relation, which means facilitates'the introduc-' tion to or removal of the dollies fromthe front head. I 1

' As a still further object the invention contemplates a dolly hammer cylinder front head which is comparatively simple in its construction, inexpensive to manufacture and which is readily applicable to or removable .from the dolly hammer cylinder.

With the above recited and other objects A in view, the invention resides in 'the'novel construction set forth in the following specification, partici'ilarly pointed out in the appended claims and illustrated in the accompanying'drawings, it being understood that the right is reserved to embodiments other than, those actually illustrated herein to the V full'extentindicated by the general meaning of the terms in pressed.

In the drawings- Figure 1 is a'fragmentary side elevation o'f'a drill sharpening machine with the dolly hammer cylinder front head constructed in accordance'with the invention'applied thereto, parts being broken away to disclosethef underlying structure;

F 2 is an enlarged longitudinal sec tional view through the front head; 7 Fig. 3 is an enlarged plan view thereof;

And Fig. 4 is a transverse sectional view taken approximately on the line 4-4. ofv

Fig. 2.

[Referring to the drawings by characters of reference, A'designates the base of the machine, B the lower die block, C the bit forming die having a bore D for receiving thefbit. The dolly hammer cylinder E has mounted therein'the dolly hammer F, to

I which cylinder fluid under pressure is admitted for actuating the hammer to coact in order to increase both the length of life body isprovided with a rearward tubular extension '16 which is provided with an outer which the claims are ex-;

axialenlarged bore 17 for receiving therein f the forward end of the dolly hammer cylinder' E, the. said extension being provided with lateral apertured ears 18 for alignment with similar ears H on the-dolly hammer cylinder E to receive therethrough clamping bolts 19 for attaching the front head to the cylinder.- The extension '16 is further provided with an inner reduced bore 20 communicating with the bore 17 and through which the forward end of the hammer F ismovable into'engagement with the collar I at the rear end of the dolly shank J. The front and} rear end-walls l4 and 15 of the front 'head body 10 are provided with substantially semi-circular recesses 21, the recess inthe rear wall communicating with the in 28 adjacentv the lower ncr bore 20 and said recess being of slightly lesser diameter than the bore 20 to provide a stop shoulder 22 for arresting or limiting the forward movement of the dolly by the engagement of the collar I therewith. Within the lower end ofthe body 10' a laterally movable wedge block 23 is arranged, which block is of an appropriate length to snugly fit between the ends walls 14 and 15, while the same is of lesser width than the distance between the side walls 12 and 13.

A hearing block or shoe 24 of a length and width to snugly fit between the side walls 12 and 13, and end walls 1 1 and 15 is arranged within the body 10, the same being provided with a laterally inclined lower wedge face 25 which cooperates with a complementary laterally inclined upper wedge face 26 on the wedge block 23. The bearingblock or shoe 2% is provided with a substantially semi-circular bearing recess 27 inv its upper face within which the shank J of the dolly (if is mounted, The body 10 is provided with laterally projecting bosses portion of the side walls 12 and13 and said bosses are provided with threaded bores, 29 which communicate with the interior of the body 10 and receive therethrough the threaded shanks 30 of adjusting screws 31, the inner ends of which screws engage respectively with the opposite sides of the wedge block 23 for moving or sliding the same laterally to effect through the cooperating wedge faces 25 and 26 the raising and lowering of the bearing block or shoe 24. Lock nuts 32 are threadedly arranged on the shanks 30 for retaining the adjusting screws in adjusted position. The improved front head further includesa cover 33 which is adapted when in closed position to rest upon the upper open end of the body 10 for holding the dolly shank J in the bearing recess 27 of the bearing block 24; and for co-operating with the flattened side K of the dolly shankto prevent rotary movement thereof. As illustrated the cover 33 is swiveled to. the lower end of: a clamp screw 34 by virtue of a pin 35 intersecting the circumferential groove 36 in the lower end of the clamp screw 34, The clamp screw 34 extends through the internally threaded nut 37 in a cross-bar 38 which is hingedly connected adjacent one endby a hinge pin 39 to the spaced hinge knuckles 40 projecting upwardly from the side wall 12 of the body 10'. At its opposite free end the cross-bar 38 has hinged thereto by a hinge pin 41 a bail 4-2, the bight 13 of which is engageable under a keeper lug 44. The cover 33 is provided with laterally projecting ears 15, one of whiclris engageable between the spaced hingeknuckles 10 andthe other of which is received between the furcations 46 at the bifurcated upper end of the keeper 44-. The inner end of the tubular extension 16'is cutaway on its upper side at 47 and the rear or inner end of the cover 33 extends intothe, cut-away portion and is provided with an arcuate recess 48 which completes the bore 20 when the cover is closed, but partially opens the same when the cover is open to allowf'orthe removal of the collar I. The cover 33 is provided with an opening 49-f0r the introduction of oil to the interior of the front head. The crossbar is provided with a tail 50 which projects from the hinged end 39, which tail engages with the side wall 12to limit the swinging of the cover and crossbar in the open position. The-dolly is provided with the usual enlarged head L at its forward end which produces a shoulder M at its juncture'with. the shank J ,vwhich shoulder coacts with the front end wall 14' and prevents engagement of the shoulder with the shoe or hearing block 24. The bottom wall 11 Of the body 10 is provided with an opening 51 through which a tool may be inserted for forcing the wedge block and bearing block or shoe from within the body when it is desired to remove the same.

i In practice, when the shank .I' of the dolly and the bearing recess 27 of'the hearing shoe become worn, the adjusting screw 31 extend ing, through the wall 12 is unscrewed and at the same time the opposite adjusting. screw 31 extending through the wall 13 is screwed up to move the wedge block -J3 toward the left in Fig, 4;. This will effect a raising of the bearing block 24: and a consequent compensation for the wear. When it is. desired to open the coverfor' the purpose of removing the dolly or hearing block 2%, the

clamp screw 34 is, turned in the nut 3'2? of the cross-bar in a direction to movethe free end of, the. crossbar and bail 4E2. downwardly whereby the biglit 43 may be disengaged from the keeperrlugtet. The operator may then swing the cross bar on its hinge pin 39 upwardly to lift the cover from its covering position thereby permitting of the removal of the dolly and the bearing block or shoe 24'. By means of the adjusting screws 31 any degree of looseness or tightness of fit of' the dolly maybe. accomplishedi It will. be

noted'that'. in thepresent instance he springs or other means are employed for returning the dolly, after it has struck the blow on the face of the drillbit, as, it has been. found in actual practice that there is no need for such means due to the fact that the rebound or recoil of' the dolly is suilicient for. returningthe same to deliver the nextv blow. As a; matter of fact it has been found that devices for returning. the dolly only tend to retard the effect of the blow delivered by the dolly hammer on the dolly.

While the, device-has I been illustrated and 1 primarily designed for use in connection front head including a box-like body having side walls and front and rear walls forming between them a bearing cavity and of which the front and rear walls are respectively engageable by the head and collar of the dolly, a bearing member for the dolly disposed in the cavity and extending in use slightly above the front and rear walls and protected by the latter from the dolly head and collar,

having an inclined lower face, a wedge shiftable laterally in the base of the cavity and extending from the front to the rear walls thereof, adjusting means for adjusting said wedge and securing the same in adjusting position, and a cover extending across and secured against the upper edges of the side walls of the body.

2. In a drill bit sharpening machine employing a dolly having a head at its outer 'end and a collar at its inner end, a cylinder front head including a box-like body having side walls and front and rear walls forming between them a bearing cavity and to which the front and rear walls are respectively engageable by the head and collar of the dolly, a bearing member for the dolly disposed in the cavity and extending in use slightly above the front and rear walls and protected by the latter from the dolly head and collar, having an inclined lower face, a wedge shiftable laterally in the base of the cavity and extending from the front to the rear walls thereof, adjusting means for adjusting said wedge and securing the same in adjusting position, and a cover extending across and secured against the upper edges of the side walls of the body, said cover having a flat end surface and said dolly having a flattened upper portion cooperating with the lower surface ofthe cover to prevent rotation of the dolly in use.

3. In a drill bit sharpening machine employing a dolly having a head at its outer end and a collar atv its inner end, a cylinder front head including a box-like body having side walls and front and rear walls forming between them a' bearing cavity and to which the front and rear walls are respectively engageable by the head and collar of the dolly, a bearing member for the dolly disposed in the cavity and extending in use slightly above the front and rear walls and protected by the latter from the dolly head and collar, having an inclined lower face, a wedge shiftable laterally in the base of the cavity and extending from the front to the rear walls thereof, adjusting means for adjusting said wedge and securing the same in adjusting position, and a cover extending across and secured against the upper edges of the side walls of the body, said cover having an oil opening therethrough and means for clamping the cover in place including an, upper cross-bar in movable engagement with the body and a clamping screw threaded through the cross-bar and having a swiveled connection centrally of the cover.

4. In a drill bit sharpening machine, a dolly having a head and a collar at its opposite endsv a dolly hammer cylinder front head, an adjustable and removable bearing for the dolly mounted in the front head, means for effecting adjustments of said bearing to compensate for wear thereon and on the dolly, said means comprising a wedge block, interengaging wedge faces on the bearing and wedge block, devices'for operatively moving the wedge block to obtain said adjustments, and guide means for the bearing provided on the-front head body, certain of said guide means constituting stops for en gagement with the'head and collarof the dolly for limiting themovement of the dolly whereby to prevent engagement of the same with the bearing.

MARTIN McHALE. 

